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Investment In and Advances to Unconsolidated Affiliates - Miami Valley Gaming Joint Venture (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]        
Other liabilities $ 100,000 $ 100,000    
Proceeds from equity method investment $ 18,000,000 15,600,000 $ 15,200,000  
Miami Valley Gaming LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%     50.00%
Note payable term 6 years      
Other liabilities $ 50,000,000      
Secured note payable fixed interest rate 5.00%      
Principal repayments of secured note payable $ 33,300,000      
Proceeds from equity method investment $ 17,000,000 $ 15,000,000 $ 15,000,000  
Delaware North Companies Gaming & Entertainment Inc. | Miami Valley Gaming LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%